requirements.txt updates

TOOLS.md

+# Tools
+
+## UML: Gaphor
+* gaphor in requirements.txt
+* run_uml.sh
+* gaphor needs 3rd party requirements:
+    * asadddas
+    * dasdas
+    * dsadas
+
+

requirements.txt

+# --------------------------------------------------------------
+# Covid 19 Data - Requirements
+# --------------------------------------------------------------
 setuptools==53.0.0
 pip==21.0.1
 pip-licenses==3.3.0
@@ -59,9 +62,8 @@ scipy>=1.5.0
 StatisticalDiagrams>=20.5
 # --------------------------------------------------------------
 # Tools:
-#
-#gaphor==2.2.1
 # --------------------------------------------------------------
+gaphor>=2.2.1
 #
 #
 # ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++